Spool wound with a gold alloy wire used for a bonding process

Abstract

A spool includes a body and a chromium layer. The body integrally includes a first portion having an annular shape and a second portion having a tubular shape. The body is formed using plastic. The first portion is provided on both sides of the second portion. The chromium layer is plated on the body. The chromium layer has a uniform thickness of about 0.1 μm to about 100 μm. A gold alloy wire is wound on the chromium layer. The chromium layer has a glossy surface. The spool is combined with a bonding device such that the spool electrically connects the bonding device to the gold alloy wire wound on the chromium layer. The shape of the spool is not easily changed by an external impact. When the gold alloy wire is wound on the spool, a scratch is not formed on the spool. Furthermore, the cost required for forming the spool is relatively small so that the spool may be used as an expendable supply. As a result, a recycling process is not required.

1. A spool comprising:
 a body integrally including a first portion having an annular shape and a second portion having a tubular shape, the body comprising plastic, the first portion being provided on both ends of the second portion, 
 a chromium layer plated on the body, and 
 a gold alloy wire wound on the chromium layer, wherein the chromium layer is combined with a bonding device such that the bonding device is electrically connected to the chromium layer and the gold alloy wire wound on the chromium layer is electrically connected to the bonding device through the chromium layer without a physical contact between the gold alloy wire and the bonding device. 
 
     
     
       2. The spool of  claim 1 , wherein the chromium layer has a thickness of 0.1 μm to 100 μm. 
     
     
       3. The spool of  claim 1 , wherein the plastic comprises acrylonitrile butadiene styrene copolymer or polystyrene copolymer. 
     
     
       4. The spool of  claim 1 , wherein the chromium layer comprises trivalent chromium. 
     
     
       5. The spool of  claim 1 , wherein the chromium layer has a glossy surface. 
     
     
       6. The spool of  claim 1 , further comprising a first adhesion layer formed on the body and a second adhesion layer formed on the first adhesion layer, wherein the chromium layer is formed on the second adhesion layer. 
     
     
       7. The spool of  claim 6 , wherein the first adhesion layer comprises copper or nickel. 
     
     
       8. The spool of  claim 6 , wherein the second adhesion layer comprises nickel.